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Inheritance and Expression of Adult Plant Resistance to Leaf Rust in Era Wheat. B. Ezzahiri, Department of Plant Pathology, Institut Agronomique et Veterinaire Hassan II, B.P. 6202, Rabat-Instituts, Morocco. A. P. Roelfs, Cereal Rust Laboratory, Agricultural Research Service, U.S. Department of Agriculture, University of Minnesota, St. Paul 55108. Plant Dis. 73:549-551. Accepted for publication 13 December 1988. This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. The American Phytopathological Society, 1989. DOI: 10.1094/PD-73-0549.

The inheritance of adult plant resistance to leaf rust (Puccinia recondita f. sp. tritici) was studied in the bread wheat (Triticum aestivum) cultivar Era in Morocco and the United States. Adult plant resistance was shown to be conferred by two complementary genes, Lr13 and Lr34. The magnitude of the effect resulting from the gene interaction was influenced by environment. Lr10 and an unknown gene for seedling resistance were also present in Era.